diff --git a/Models/Database/Mission.cs b/Models/Database/Mission.cs
index 0915321..41fa39e 100644
--- a/Models/Database/Mission.cs
+++ b/Models/Database/Mission.cs
@@ -2,7 +2,7 @@ namespace GamificationService.Models.Database;
 
 public class Mission
 {
-    public long Id { get; set; }
+    public Guid Id { get; set; }
     public string Title { get; set; } = string.Empty;
     public string Description { get; set; } = string.Empty;
     public MissionCategory? MissionCategory { get; set; }
diff --git a/Models/Database/MissionCategory.cs b/Models/Database/MissionCategory.cs
index 30cb3dd..2249752 100644
--- a/Models/Database/MissionCategory.cs
+++ b/Models/Database/MissionCategory.cs
@@ -2,7 +2,7 @@ namespace GamificationService.Models.Database;
 
 public class MissionCategory
 {
-    public long Id { get; set; }
+    public Guid Id { get; set; }
     public string Title { get; set; } = string.Empty;
 
     public ICollection<Mission> Missions { get; set; } = new List<Mission>();
diff --git a/Models/Database/MissionItemReward.cs b/Models/Database/MissionItemReward.cs
index 480f43e..7a8d909 100644
--- a/Models/Database/MissionItemReward.cs
+++ b/Models/Database/MissionItemReward.cs
@@ -2,8 +2,8 @@ namespace GamificationService.Models.Database;
 
 public class MissionItemReward
 {
-    public long Id { get; set; }
-    public long ItemId { get; set; }
-    public long MissionId { get; set; }
+    public Guid Id { get; set; }
+    public Guid ItemId { get; set; }
+    public Guid MissionId { get; set; }
     public required Mission Mission { get; set; }
 }
diff --git a/Models/Database/MissionRankRule.cs b/Models/Database/MissionRankRule.cs
index f3eb840..6cd7b47 100644
--- a/Models/Database/MissionRankRule.cs
+++ b/Models/Database/MissionRankRule.cs
@@ -4,10 +4,10 @@ namespace GamificationService.Models.Database;
 
 public class MissionRankRule
 {
-    public long Id { get; set; }
-    public long MissionId { get; set; }
+    public Guid Id { get; set; }
+    public Guid MissionId { get; set; }
     public Mission Mission { get; set; } = null!;
-    public long RankId { get; set; }
+    public Guid RankId { get; set; }
     public Rank Rank { get; set; } = null!;
     public MissionRankRuleType Type { get; set; }
 }
diff --git a/Models/Database/MissionSkillReward.cs b/Models/Database/MissionSkillReward.cs
index 1b903ba..b2b53c2 100644
--- a/Models/Database/MissionSkillReward.cs
+++ b/Models/Database/MissionSkillReward.cs
@@ -2,8 +2,8 @@ namespace GamificationService.Models.Database;
 
 public class MissionSkillReward
 {
-    public long Id { get; set; }
-    public long MissionId { get; set; }
+    public Guid Id { get; set; }
+    public Guid MissionId { get; set; }
     public Mission Mission { get; set; } = null!;
     public long SkillId { get; set; }
     public Skill Skill { get; set; } = null!;
diff --git a/Models/Database/Player.cs b/Models/Database/Player.cs
index 473bc1f..adbfc01 100644
--- a/Models/Database/Player.cs
+++ b/Models/Database/Player.cs
@@ -2,10 +2,10 @@ namespace GamificationService.Models.Database;
 
 public class Player
 {
-    public long Id { get; set; }
-    public long UserId { get; set; }
+    public Guid Id { get; set; }
+    public Guid UserId { get; set; }
     public Rank? Rank { get; set; }
-    public long RankId {get; set; }
+    public Guid RankId {get; set; }
     public int Experience { get; set; }
 
     public ICollection<PlayerMission> PlayerMissions { get; set; } = new List<PlayerMission>();
diff --git a/Models/Database/PlayerMission.cs b/Models/Database/PlayerMission.cs
index 0b7462d..321e1b6 100644
--- a/Models/Database/PlayerMission.cs
+++ b/Models/Database/PlayerMission.cs
@@ -2,10 +2,10 @@ namespace GamificationService.Models.Database;
 
 public class PlayerMission
 {
-    public long Id { get; set; }
-    public long PlayerId { get; set; }
+    public Guid Id { get; set; }
+    public Guid PlayerId { get; set; }
     public required Player Player { get; set; }
-    public long MissionId { get; set; }
+    public Guid MissionId { get; set; }
     public required Mission Mission { get; set; }
     public DateTime? Completed { get; set; }
     public DateTime? RewardsRedeemed { get; set; }
diff --git a/Models/Database/PlayerSkill.cs b/Models/Database/PlayerSkill.cs
index ff944f9..0db4ec6 100644
--- a/Models/Database/PlayerSkill.cs
+++ b/Models/Database/PlayerSkill.cs
@@ -2,10 +2,10 @@ namespace GamificationService.Models.Database;
 
 public class PlayerSkill
 {
-    public long Id { get; set; }
-    public long PlayerId { get; set; }
+    public Guid Id { get; set; }
+    public Guid PlayerId { get; set; }
     public Player Player { get; set; } = null!;
-    public long SkillId { get; set; }
+    public Guid SkillId { get; set; }
     public Skill Skill { get; set; } = null!;
     public int Score { get; set; }
 }
diff --git a/Models/Database/Rank.cs b/Models/Database/Rank.cs
index 7a1338b..0405d2e 100644
--- a/Models/Database/Rank.cs
+++ b/Models/Database/Rank.cs
@@ -2,7 +2,7 @@ namespace GamificationService.Models.Database;
 
 public class Rank
 {
-    public long Id { get; set; }
+    public Guid Id { get; set; }
     public string Title { get; set; } = string.Empty;
     public int ExpNeeded { get; set; }
 
diff --git a/Models/Database/RankMissionRule.cs b/Models/Database/RankMissionRule.cs
index 2ac2432..ec25ee9 100644
--- a/Models/Database/RankMissionRule.cs
+++ b/Models/Database/RankMissionRule.cs
@@ -2,9 +2,9 @@ namespace GamificationService.Models.Database;
 
 public class RankMissionRule
 {
-    public long Id { get; set; }
-    public long RankId { get; set; }
+    public Guid Id { get; set; }
+    public Guid RankId { get; set; }
     public Rank Rank { get; set; } = null!;
-    public long MissionId { get; set; }
+    public Guid MissionId { get; set; }
     public Mission Mission { get; set; } = null!;
 }
diff --git a/Models/Database/RankSkillRule.cs b/Models/Database/RankSkillRule.cs
index 19cd4b9..211cf1e 100644
--- a/Models/Database/RankSkillRule.cs
+++ b/Models/Database/RankSkillRule.cs
@@ -2,10 +2,10 @@ namespace GamificationService.Models.Database;
 
 public class RankSkillRule
 {
-    public long Id { get; set; }
-    public long RankId { get; set; }
+    public Guid Id { get; set; }
+    public Guid RankId { get; set; }
     public Rank Rank { get; set; } = null!;
-    public long SkillId { get; set; }
+    public Guid SkillId { get; set; }
     public Skill Skill { get; set; } = null!;
     public int Min { get; set; }
 }
diff --git a/Models/Database/Skill.cs b/Models/Database/Skill.cs
index 1f4f43b..5f58dfd 100644
--- a/Models/Database/Skill.cs
+++ b/Models/Database/Skill.cs
@@ -2,7 +2,7 @@ namespace GamificationService.Models.Database;
 
 public class Skill
 {
-    public long Id { get; set; }
+    public Guid Id { get; set; }
     public string Title { get; set; } = string.Empty;
     public ICollection<MissionSkillReward> MissionSkillRewards { get; set; } = new List<MissionSkillReward>();
     public ICollection<RankSkillRule> RankSkillRules { get; set; } = new List<RankSkillRule>();